Combustion exhaust gas sensor structure, particularly for automo

Details Combustion exhaust gas sensor structure, particularly for automo Combustion exhaust gas sensor structure, particularly for automo

1983-01-26

1989-04-04

Niebling, John F.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

338 34, G01N 2746

Patent

active

048183636

ABSTRACT:
To retain a plate-like sensing element, for example made of ceramic, in position within a metallic housing without danger of breakage or loosening under conditions of vibrations or shock or wide swings of temperature and substantial temperature gradients, a metallic housing has a longitudinal opening wherein in which two sealing elements are located, for example made of aluminum oxide. The sealing elements are formed, each, with an internal pocket, for example extending conically outwardly towards their meeting surfaces, to form a chamber. The chamber is filled with a resiliently compressible powder or pulverized material, for example talcum, and separates the elements by a gap (31) extending outwardly to the walls of the metallic housing. The sensor element is passed through slits formed in the end regions of the sealing elements (26, 27) and is retained in position by the compressible powder or pulverized material. The sealing elements are retained in resiliently compressed condition, towards each other, by a spring (14, 14'), for example a washer or dish-spring, held in position and exerting direct (FIG. 1) or indirect (FIG. 4) pressure tending to compress the powdery or pulverized substance (28) surrounding the portion of the sensing element (15) therebetween, and located in said chamber. Strain-relief connections can be made to terminal portions (25) of conductive tracks (24) extending along the major surfaces of the sensing element by passing end portions of spring wire clips (FIGS. 4, 6) through suitably aligned holes or grooves in a contact guide sleeve (42).

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patent: 4310401 (1982-01-01), Stahl
patent: 4310401 (1982-01-01), Stahl
patent: 4334974 (1982-06-01), Muller et al.

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